The VPN connection connects fine with no problems except for I cannot download anything more than 2kb (binary files, like a GIF picture) from the Windows server via the VPN connection. However, text files larger than 2kb or any size are fine. I also cannot use Remote Desktop connection to the Windows 2003 server either - it brings up a grey background window and does not go further than that. I notice the VPN connection's status Sent total is much greater than the Received bytes total.

I was using a normal Netgear ADSL router before and never have any problems. The above problem only occurs when I started using the Cisco 837 router. I think it's the MTU problem, but tried resetting and restarting with no luck.

Re: VPN outside problem

Hi there,

The ip tcp adjust-mss command helps prevent TCP sessions from being dropped by adjusting the MSS value of the TCP SYN packets. The ip tcp adjust-mss command is effective only for TCP connections passing through the router. In most cases, the optimum value for the max-segment-size argument is 1452 bytes.

Re: VPN outside problem

Thanks for the response. Yes your answer helped in resolving the problem, i.e. I had to

1. do a "ip tcp adjust-mss 1452" against the e0 interface (just like your answer)

2. change the MTU valud to 1300 in my Windows XP LAN

The combination of the above two resolves the VPN packet problem.

While we are on this subject, is there a IOS command I can use so my VPN connection stays active after the idle time, note I think my Windows VPN icon still says connected but all tcp connections are dead?

Re: VPN outside problem

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